Gens get done really quick and if you have no map pressure as a killer the game could end really quickly, they have spoken about adding secondary objectives but I think the end game needs an overhaul, it would be fine if gens popped quickly if the end game had more to it then rushing to an exit gate and opening it.

If a killer if gen rushed then they don't really stand a chance during the end game unless they have noed, but even then that'll only probably guarantee you 1 kill.